Note: Passwords are processed locally in your browser and never sent anywhere.
Strength Analysis
Entropy143 bitsExcellent
25
Length
52
Character Pool
Estimated Brute Force (Trillion guesses/sec)
3.54e+23 Years
About this calculator
Overview
Password entropy measures password strength in bits. Higher entropy = harder to crack. Depends on length and character set. 80+ bits recommended for strong passwords.
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Pro Tips
Lowercase only: 26 chars (4.7 bits/char).
Mixed case: 52 chars (5.7 bits/char).
Add numbers: 62 chars (5.95 bits/char).
Add symbols: 94 chars (6.55 bits/char).
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Fun Facts
"8 char lowercase: 37 bits (weak)."
"12 char mixed+symbols: 78 bits (strong)."
"16+ char passphrase: 100+ bits (very strong)."
"Brute force: 80 bits = centuries to crack."
Formula: Entropy = Length × log2(Character Set Size)
